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This Paper proposes a Novel frame work for reversible data hiding scheme over an encrypted cover medium. Reversible data hiding techniques are gaining huge importance in recent years due to its excellent feature of enabling zero distortion reconstruction of both cover medium information as well as secret data information, while protecting the confidentiality of the payload image information. We propose...
Steganography is one of the most important information hiding mechanism, which can be used along with cryptography for providing adequate data security. The common Steganographic mediums used are text, image, audio and video for hiding secret information. In the case of image medium, mostly least significant bits of pixels of a cover image are used for hiding secret information. In this paper, a new...
The remarkable development in the field of information technology and the diversity of multimedia applications in recent years imply the development of more efficient image compression techniques to improve the data transmission and storage capacity. The recent researches showed that classical wavelets are not able to exploit optimally the geometric regularities along the contours and edges of objects...
We present a steganographic protocol based on linear error-block codes. Recent works have showed that these codes allow to increase the number of information carrier bits within a given cover by exploiting multiple bit planes (not only LSB plane) from pixels which would not have a perceptible influence on the cover. We employ a parameter, called heterogeneity, to assess the ability of pixels to be...
Currently, the data storage medium in digital form are widely applied in various fields, including in the medical world. The excessive size of the digital medical image digital poses problems in terms of storage and the time to transmit these images through the Internet. To overcome these problems, a digital image compression can be conducted. This procedure is conducted to maintain the image quality...
Selective encryption approaches for efficient multimedia content protection is proposed in wireless multimedia sensor networks (WMSNs) by many authors. Apart from these methodologies, the other important aspect which is discussed in some literatures is the combined optimization of multimedia quality, content protection and energy issues pertaining to communication. However in these joint optimization...
This paper describes a steganography technique in which text is concealed in an image. The lower nibble of each image byte is modified so as to contain each nibble of the input text. The steganography algorithm used in this implementation maximises on data capacity and also ensures security. The Java programming language is used for its comprehensive libraries and ease of use. A simple GUI has been...
Image Compression using Huffman coding technique is simpler & easiest compression technique. Compression of image is an important task as its implementation is easy and obtains less memory. The purpose of this paper is to analyse Huffman coding technique which is basically used to remove the redundant bits in data by analysing different characteristics or specification like Peak Signal to Noise...
In this paper, a compressed sensing based scalable video coding using discrete wavelet transform (DWT) for space applications is presented. The proposed method is aimed at reducing the requirement of on-board memory, station contact time and data archival volume. Compressive sensing (CS) has been applied to encode the distributed wavelet coefficients into linear measurements. Since prior knowledge...
This papers deals with an efficient image compression technique for images having low dynamic range. The images with low dynamic range generally have low intensity variations. By considering this fundamental characteristic into account we can go for image compression at higher ratio with small modifications to the existing block based EZW algorithm. To achieve the improvement in compression ratio,...
In this paper, a new method of image steganography in spatial domain on gray images blend with cryptography is present. Steganography and cryptography are used to hide message and its meaning respectively. By this method, the message is first encrypted using Vernam cipher algorithm and then the message (encrypted) is embedded inside an image using the new image steganography method i.e. LSB with Shifting...
This paper proposes a Improved Fractal image compression (IFIC) method for Color images carried out for variable block size. The image here is partitioned in to block by considering maximum and minimum size of the range. The proposed method divides color image into three RGB planes and applies fractal transformation with entropy coding. By applying the inverse transforms and iterative functions, the...
With many observations, we find that there exists a logarithmic relationship between the average collage error (ACER) and the quality of decoded images. By making use of the ACER in the encoding process, the quality of decoded images can be predicted without fractal decoding. In order to shorten the prediction process further, an accelerated version of the prediction method is proposed. By theoretical...
In this paper fractal encoding of images using the wavelet transform is proposed. Fractal encoding is used to produce an image with good visual quality in less encoding time. Quadtree partitioning is applied iteratively during encoding, and fractal coding is executed for JPEG, PNG and BMP HD images in two conditions: by supplying the noise to the input image and without any noise added to the input...
In this paper an adaptive feedback based Reversible Watermarking (RW) algorithm using Difference Expansion (DE) is designed for gray-scale still pictures. The algorithm obtains automatically the highest payload size and the corresponding embedding threshold and also determines the best watermarked picture for an input cover picture with respect to the quality metric Peak-Signal-to-Noise Ratio (PSNR)...
The implementation of software based video decoders is an advantageous solution over traditional dedicated hardware real-time systems. However, guaranteeing real-time performance, needed when processing video/audio bit-streams, by scheduling processing tasks of variable load and that might exceed the available resources, is an extremely difficult and in many cases an impossible challenge. In this...
Even with use of restart intervals, some residual errors remain in the decoded JPEG images after transmission. In order to improve the image quality, robust decoding techniques are useful. First, we propose error detection techniques, then error compensation and concealment techniques for the damaged blocks. Depending on the entropy coding and on the neighbourhood template, improvements between 3...
We introduce Combined Multiple Image Filter (CMIF) as a new approach for noise removal. The processed output is the Bayesian mean square error estimate of the original image. A set of four filters are selected to improve the quality of noisy image that contains regions with different characteristics. Feature vectors are computed at each pixel in order to predict the performance of the filters in estimating...
We propose a compression scheme for still images, by exploiting the theory of Distributed Coding of correlated multi-sources. Two corrupted versions of an image are encoded separately but decoding jointly. Our approach results in twofold. i) use of decomposition of low-pass wavelet co-efficients for creating the Side Information, and ii) variable-length coset creation by estimating the bit-rate of...
Many advanced video transmission techniques rely on per-packet distortion estimates. To compute reliable estimates, however, the decoder inner workings, including the concealment module used in case of packet losses, should be fully known at the encoder. This paper explores the effects on video distortion estimation of encoder-side erroneous assumptions about the concealment technique used by the...
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